时效温度对Co-Cu合金化马氏体时效硬化不锈钢组织性能的影响  

Effect of aging temperature on microstructure and properties of Co-Cu alloying maraging hardening stainless steel

作　　者：李科欣[1] 邹德宁[1] 张威 张英波[1] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《金属热处理》2017年第11期72-76,共5页Heat Treatment of Metals

基　　金：国家自然科学基金钢铁联合基金(u1460104);陕西省自然科学基金(2015JM197);金属材料强度重点实验室基金(20151202)

摘　　要：利用光学显微镜(OM)、透射电镜(TEM)、X射线衍射仪(XRD)、拉伸和硬度试验,研究Co-Cu合金化马氏体时效硬化不锈钢不同时效温度(440~520℃)处理后的组织和性能。结果表明:随着时效温度的升高,马氏体板条变宽且内部位错密度降低,薄膜状逆转变奥氏体量增多,富铜相颗粒弥散析出并逐渐长大粗化;强度、硬度先升后降,伸长率先降后升。试验钢在480℃时效2 h后具有良好的综合力学性能,此时抗拉强度、屈服强度、伸长率及硬度分别为1401 MPa、1312 MPa、12%和387.1 HV0.5。After aging at different temperatures（ 440-520 ℃）,the microstructure and mechanical properties of Co-Cu alloying maraging hardening stainless steel were studied by optical microscopy（ OM）,transmission electron microscopy（ TEM）,X-ray diffraction（ XRD）,tensile test and microhardness test. The results show that with the aging temperature increasing,the martensite lath grows wider and the dislocation density decreases. Meanwhile,the amount of reversed austenite increases and the copper-rich phase gradually coarsens.Correspondingly,the strength and hardness increase at first and decrease later,while the value of toughness falls at first and rises later. The tested steel has the best performance after aging at 480 ℃ for 2 h,with the tensile strength,yield strength,elongation and microhardness being 1401 MPa,1312 MPa,12% and 387. 1 HV0. 5,respectively.

关 键 词：Co-Cu合金化马氏体时效硬化不锈钢 时效温度 显微组织 力学性能 

分 类 号：TG161[金属学及工艺—热处理]